Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for magnetizing, roasting and sorting low-grade iron ores

A low-grade iron ore magnetization roasting technology, applied in chemical instruments and methods, magnetic separation, solid separation, etc., can solve the problems of waste of resources, low quality of mine iron concentrate, and incapable of large-scale development and utilization, and achieve improvement The effect of spheroidization, magnetization reduction and uniform roasting

Inactive Publication Date: 2013-04-24
CENT SOUTH UNIV
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is still no breakthrough in the beneficiation technology for complex and refractory iron oxide ores such as hematite with fine particle size and gangue mainly iron-containing silicates, which account for more than 25% of the total reserves, and low-grade limonite and siderite. This type of iron ore resources cannot be fully recycled, and some tailings have high iron content (such as Daye Iron Mine, Tonglushan Copper-Iron Mine), resulting in waste of resources, and some mines have low quality iron concentrates ( Such as Baotou Iron and Steel Concentrator), resulting in the inability to obtain high-quality iron concentrate, which affects the efficiency of blast furnace smelting, and there are low-grade limonite and siderite, which cannot be developed and utilized on a large scale at present

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for magnetizing, roasting and sorting low-grade iron ores

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The method of magnetic roasting and sorting of low-grade iron ore. After the low-grade iron ore is pretreated, wet grinding and non-wetting abrasives are mixed to form pellets; the pellets are preheated and subjected to air-based reduction magnetization roasting; and then cooled Obtain iron ore concentrate after magnetic separation, the steps are:

[0025] (1), the low-grade iron ore is pretreated, and the method of pretreatment is grinding, wet grinding or high-pressure roller milling, and the pretreatment time is 6min, and the mass percentage of the raw material particle size after pretreatment is less than 0.074mm is greater than 41.65%;

[0026] (2) The pretreated raw materials are mixed evenly, and the wet grinding and non-wetting abrasives are mixed at a mass ratio of 70:30, and granulated in a disc pelletizer to obtain a particle size of 2mm to 5mm. Balls, granulated balls have a moisture content of 10.5%, and under the action of 1m / s high-temperature airflow at ...

Embodiment 2

[0031] The method of magnetic roasting and sorting of low-grade iron ore. After the low-grade iron ore is pretreated, wet grinding and non-wetting abrasives are mixed to form pellets; the pellets are preheated and subjected to air-based reduction magnetization roasting; and then cooled Obtain iron ore concentrate after magnetic separation, the steps are:

[0032] (1), the low-grade iron ore is pretreated, and the method of pretreatment is ore grinding, wet grinding or high-pressure roller milling, and the pretreatment time is 5min, and the mass percentage of the raw material particle size after pretreatment is less than 0.074mm is 40.25%;

[0033] (2) The pretreated raw materials are mixed evenly, and the wet grinding and non-wetting abrasives are mixed at a mass ratio of 70:30, and granulated in a disc pelletizer to obtain a particle size of 2mm to 5mm. Balls, granulated balls have a moisture content of 10.5%, and under the action of 1m / s high-temperature airflow at 400°C, the ...

Embodiment 3

[0038] The method of magnetic roasting and sorting of low-grade iron ore. After the low-grade iron ore is pretreated, wet grinding and non-wetting abrasives are mixed to form pellets; the pellets are preheated and subjected to air-based reduction magnetization roasting; and then cooled Obtain iron ore concentrate after magnetic separation, the steps are:

[0039] (1), the low-grade iron ore is pretreated, and the method of pretreatment is ore grinding, wet grinding or high-pressure roller milling, and the pretreatment time is 8min, and the mass percentage of the raw material particle size after pretreatment is less than 0.074mm is 42.30%;

[0040] (2), the pretreated raw materials are mixed evenly, and the wet grinding and non-wetting abrasives are mixed evenly in a mass ratio of 30:70, and granulated in a cylinder pelletizer to obtain granulated pellets with a particle size of 5mm. The moisture content of the granulation pellets is 9.5%, and the pulverization rate of less tha...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
particle diameteraaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for magnetizing, roasting and sorting low-grade iron ores. The method comprises the following steps of: firstly performing pretreatment on the low-grade iron ores, wherein the content of -0.074mm-grade pretreated material is above 40%, clay mineral in the low-grade iron ores is taken as a bonding agent, or a small quantity of bentonite and other bonding agents areadded for uniformly mixing; preparing into small balls with the particle size of 2-5mm by a circular disc or cylinder pelletizer; uniformly laying the small balls after screening in a simulation reactor of a belt type roasting machine, wherein the thickness of a material layer is 200mm-300mm; and respectively performing drying, preheating, oxidizing roasting, magnetizing roasting and cooling treatment in five stages for getting homogeneous magnetized and roasted magnetite, and then performing magnetic separation to get iron ore concentrate. By adopting the method disclosed by the invention, the low-grade iron ores can be effectively treated, coal or coal gas and the like can be utilized for preparing reducing gas with the content of (CO plus H2) of 15-25% or secondary heat reducing gas generated in the metallurgical process can be fully utilized for performing magnetizing roasting, and the method has the characteristics of energy conservation, high efficiency and quickness.

Description

technical field [0001] The invention relates to a method for sorting iron ore, in particular to a method for magnetizing, roasting and sorting low-grade iron ore. Background technique [0002] With the continuous development of the modern iron and steel industry, my country's iron and steel production has increased year by year, and the shortage of domestic high-quality iron ore has become increasingly serious. Mineral resources have become a "bottleneck" restricting the development of my country's iron and steel industry. With the rapid development of the iron and steel industry, the demand for iron ore in China has increased sharply. The self-sufficiency rate of iron ore required by my country's iron and steel industry is only 46%. It is also hitting new highs. [0003] China's iron ore resources are rich but not rich. Among the reserves of about 58.1 billion tons (ranking the fourth in the world), 97% are lean ore, with an average grade of 33%, which is 11 percentage poin...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02B03C1/015B03C1/02
Inventor 黄柱成姜涛张元波郭宇峰李光辉杨永斌白国华田仕友易凌云
Owner CENT SOUTH UNIV